You can add an integration by going to the settings, which you can find in the right upper corner of the app. There, you can see which integrations you have already added with their corresponding email address. To add a new integration, simply press the "+" button of the integration you would like to add and follow the steps. After successfully adding your integration, you can search for your files in HQ!
How do I delete an integration?
Sadly this is not possible yet. We are working on it though and will let you know as soon as this feature is available. For now, if you want to remove our permissions to your accounts, you can go to the the account provider, e.g. https://www.dropbox.com/account/connected_apps
Do you store files in HQ and do I have to move my files to yet another online file storage?
No we do not store files in HQ. HQ offers a virtual organizing system which means you do not have to move all your files, since they stay stored in the original apps and accounts.
Can I use HQ without internet connection?
Sadly this is not possible yet. We are working on it though and will let you know as soon as this feature is available.